In some cases, researchers found exposure to cannabis pollen or smoke triggered symptoms of allergic rhinitis – caused by inflammation of the nasal passages – which resulted in sneezing, congestion, itching and a runny nose. They also discovered symptoms of conjunctivitis and asthma.

For those with serious allergies, simply touching the plant can lead to hives, itching and puffiness or swelling around the eyes.

Like with any other allergens, the researchers say people who are prone to reactions should avoid cannabis. If you’re someone with a history of anaphylaxis, they recommend carrying an EpiPen just to be safe.